Why ventilation advances in building construction techniques have led to a structure which is significantly more energy efficient and air tight than in years past.
Old brick buildings with basements venting into attic.
As a result moisture is no longer allowed to migrate freely throughout the building envelope.
See more ideas about attic vents gable vents vented.
The building codes and building science for.
Laying a second layer of fiberglass batts in the attic is an easy way to boost r values.
Doubled vapor barriers in attic.
But if the new layer has a kraft paper backing it can trap moisture and turn the layers underneath into a soggy mess.
If it s jammed too tightly into a cavity it can t trap as much air and won t be as effective.
However my architect says that on a prior project a consultant from building science recommended leaving an airspace between the brick cmu and the spray insulation.
The idea of roof vents existed for hundreds of years with natural vents employed in chinese buildings during the tang dynasty natural ventilation ducts in the buddhist monks caves and wind catchers incorporated in arabian architecture.
Oct 6 2019 explore donnapfingst s board attic vent on pinterest.
Instead fresh air still flows in through the soffit vents and travels along the underside of the sheathing until it reaches a ridge vent or can be vented with another type of exhaust vent.